Hack

See these articles and report these emails to Apple:

Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams - Apple Support

Phishing & Other Suspicious Emails

If you suspect that your Apple ID account has been compromised, follow the steps given here: If you think your Apple ID has been compromised - Apple Support

Apple will always address you by your name or the name they have on file for you and the e-mail will be from @apple.com.

Send the e-mail to Apple as an attachment to a new e-mail before deleting it.

reportphishing@apple.com